James dalgarno



(No Model.)

J1 DALG-ARN01 DEVICE FOR MOLDING PROPBLLE'R WHEELS. No. 311,817. V Patented Feb. 3, 1885.

.NlTlED rirnrns 1 PATENT Ursula.

JAMES DALGARNO,,OF DETROIT, MICHIGAN, ASSIGNOR OF ONE-HALF TO P. HENRY GRIFFIN, F SAME PLACE.

DEVlCE FOR MOLDING PROPELLER-WHEELS.

SPECIFICATION forming part of Letters Patent No. 311,817, dated February 3, 1885.

Application filed September 10, 18*4. (No model.)

To all whom i! may concern;

Be it known that I, JAMES DALGARNO, of Detroit, in the county of XVayne and State of Michigan, have invented new and useful Improvements in Devices for Molding Propeller- WVheels; and I do hereby declare that the following is a full, clear, and eXact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to an improvement in machines for molding the blades of screw-propellers in which the pitch at the hub is diiferent from the pitch of the outer edge of the blade.

The invention consists in the arrangement and construction of a sweep which can be made to follow two different guide-curvesan inner one, which defines the pitch on the hub, and an outer one, which definesthe pitch on the outer edge of the blade.

Figure 1 is a perspective of my machine as secured in position and ready for operation. Fig. 2 is a sectional elevation thereof. Fig. 3 is a perspective view of the adjustable sweep.

In the accompanying drawings, which form a part of this specification, A is the outer guide, which is preferably made of hoopiron, so as to easily bend to the required curve.

B are standards provided with slotted heads a, into which the guideAis inserted and held in position by the screws b. Each of the standards B is secured to a base-block, O, and is made in two pieces secured together in any suitable way, so as to admit of lengthening or shortening the standard. The base-blocks O are hinged together with their inner corners, and near their outer corners they are connected together by slotted links a and set screws cl, as shown, theobject of this arrangement being to easily adjust the base-blocks to segments of circles of varying radius.

D is the inner guide, in construction like the outer guide, and similarly held in position by one or more adjustable standards, 0, which are secured to the circular base-block f.

E is a round post, vertically and removably secured in position in the center of the moldboard by inserting it in ahole provided therein. This post passes centrally through the base-block f, and serves as a means for adjust ing the latter in position therein by means of the set-screw g. l

F is the arm which carries the sweep G. It is provided upon itsinner end with a sleeve, h, by means of which the arm is extended horizontally from the post, and may be turned radially around it. The sweep G is pivotally secured near its outer end,at h,to the arm F. Near its inner end it is provided with an up wardly-projecting arm, 6, which loosely engages into a loop, 70, on the arm F.

In practice it will be seen that when the outer end of the sweep is made to ride upon the outer guidecurve its inner end is free to adjust itself upon theinner guidecurve. This free adjustability of the sweep to two guidecurves of different pitch is the essential fea ture of my invention.

The device for altering the pitch of the two guides and the device for adjusting the baseblocks to circles of different radii form other desirable improvements not heretofore used in connection with similar machines.

Propeller-wheels are made of various de signs, the common form being one in which the blades start from the hub of the wheel in a round body and gradually develop into the blade form requisite for the purpose to which they are adapted. It has been found that by the blade shape being made continuous into the hub a larger surface is presented to act on the water. The difficulty of making such wheels with blades continuous to the hub is that, owing to the difference of the radius of the circle of theblade at the hub and at the outer end, it cannot be formed with the ordinary appliances of the molding art, where molds are made for castings, without patterns of the castings to be made, andit becomes use essary in making such wheels with continuous blades to make a separate pattern for each different size and form of wheel.

The device invented by me is intended to obviate this difficulty, and to permit the founder 9 5 to mold wheels with curves of different radii at the inner and outer part of the blade.

What I claim as my invention is 1. In a machine for the purposes described,

a sweep connected to a carryingarm and trav- 10o cling on and guided by two guide-curves of different pitch, substantially as and for the purpose specified.

2. Inamachine for the purposes described, the combination of the two guide-curves A D of different pitch, with the central post, E, radial arm F, and the'sweep G,pivotally secured thereto at one end and verticallymovab'le at the other end, substantially as described. l

3. In amachine for the purposes described, the combination of the outer guide, B, with the sectional base-blocks C, adjustably connected togetherhy means,substantially as described, for adjusting said base-blocks to circles of different radius.

4. In amachine for the purposes described, a guide provided with means, such as the adjustable standards B, for adjusting said guide to any desired pitch.

5. Inamachine for the purposes described, the self-adjusting sweep G, pivotally secured at one end to the radial carrier-arm F, arranged to rise on a central supportingspindle, saidsweep G being provided with means,

such as the arm 1' and loop Zc, for vertically guiding it upon its other end.

6. In a machine for the purposes described, the combination of two guide-curves of different pitch with the self-adjusting sweep G, substantially as described.-

7. In a machine for the purposes described, the inner guide, D, in combination with the circular base-blockf and set-screw g, for securing the inner guide in position and adjusting it radially around the post, substantially as specified.

8. In a machine for the purposes described, the combination of two guide-curves of differ-- ent pitch with the self-adjusting sweep G, pivotally secured at one end to the radial carrierarm F, and provided with means, such as the arm t and loop 70, for vertically guiding it upon its other end, substantially as described.

JAMES DALGARNO.

Vitnesses:

H. S. SPRAGUE, CHARLESJ. HUNT. 

